I've just started using Tasks and thought that checking the checkbox would make my command to delete apply to that Task. It doesn't. It deletes the task that is grey-selected, not the one that is checkbox-selected. So I deleted some task at the bottom of my list and I don't know what it was. How do I get it back please? Ctl-Z does not seem to do anything and I can't find Undo or even a Trash anywhere...